Communications: radio wave antennas – Antennas – Loop type
Patent
1995-06-22
1997-12-02
Le, Hoanganh T.
Communications: radio wave antennas
Antennas
Loop type
343788, 343741, 343742, H01Q 1112
Patent
active
056941390
ABSTRACT:
A short-distance communication antenna can satisfactorily transmit and receive an information signal within a regulation range of the radio law. Also, the short-distance communication antenna provided on a card reader/writer enables the card reader/writer to communicate with a non-contacting information card without being limited by the direction of the non-contacting information card upon reception. This short-distance communication antenna includes a plurality of magnetic poles disposed on a magnetic member and to and from which a magnetic flux is transmitted and received, and a coil for transmitting or transmitting and receiving the information signal mounted on at least one of the magnetic poles. Further, the short-distance communication antenna includes a housing having an aperture to and from which a magnetic flux is transmitted and received, and a coil for transmitting or transmitting and receiving the information signal mounted on said housing. Furthermore, there are also provided methods of manufacturing and of using the above short-distance communication antenna. In this case, the most specific feature of this invention is that a magnetic flux of the communication antenna is closed and a communication area is limited.
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Fujimoto Masahiro
Orihara Katsuhisa
Saito Shoshichi
Yanagibori Susumu
Le Hoanganh T.
Maioli Jay H.
Sony Corporation
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